Radiative signature of absorbing aerosol over the eastern Mediterranean basin

Mishra, Amit Kumar; Klingmüller, Klaus; Fredj, Erick; Lelieveld, Jos; Rudich, Yinon; Koren, Ilan

doi:10.5194/acp-14-7213-2014

Cited by 59 publications

(40 citation statements)

References 87 publications

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“…3), which is expected due to the different geographical areas and periods of interest between the two studies. The smooth reduction with increasing wavelength in the SSA of pure soot in this study, as well as the abrupt decrease from 1 to 3 µm in the water-soluble aerosol modes, is consistent with the findings of Mishra et al (2014Mishra et al ( , 2015 for the polluted air masses over the Mediterranean as well as with the respective model values used in the study by Takemura et al (2002) for carbonaceous and sulfate aerosol.…”

Section: The Aerosol Optical Propertiessupporting

confidence: 77%

Changes in domestic heating fuel use in Greece: effects on atmospheric chemistry and radiation

et al. 2017

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Abstract. For the past 8 years, Greece has been experiencing a major financial crisis which, among other side effects, has led to a shift in the fuel used for residential heating from fossil fuel towards biofuels, primarily wood. This study simulates the fate of the residential wood burning aerosol plume (RWB smog) and the implications on atmospheric chemistry and radiation, with the support of detailed aerosol characterization from measurements during the winter of 2013-2014 in Athens. The applied model system (TNO-MACC_II emissions and COSMO-ART model) and configuration used reproduces the measured frequent nighttime aerosol spikes (hourly PM 10 > 75 µg m −3 ) and their chemical profile (carbonaceous components and ratios). Updated temporal and chemical RWB emission profiles, derived from measurements, were used, while the level of the model performance was tested for different heating demand (HD) conditions, resulting in better agreement with measurements for T min < 9 • C. Half of the aerosol mass over the Athens basin is organic in the submicron range, of which 80 % corresponds to RWB (average values during the smog period). Although organic particles are important light scatterers, the direct radiative cooling of the aerosol plume during wintertime is found low (monthly average forcing of -0.4 W m −2 at the surface), followed by a minor feedback to the concentration levels of aerosol species. The low radiative cooling of a period with such intense air pollution conditions is attributed to the timing of the smog plume appearance, both directly (longwave radiation increases during nighttime) and indirectly (the mild effect of the residual plume on solar radiation during the next day, due to removal and dispersion processes).

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Section: The Aerosol Optical Propertiessupporting

confidence: 77%

Changes in domestic heating fuel use in Greece: effects on atmospheric chemistry and radiation

et al. 2017

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“…Smirnov et al (1995) found that for clean oceanic conditions, AOD was below 0.1 (at 550 nm) and Pace et al (2006) found an average value of 0.11 for the same marine conditions. In the Mediterranean sea in particular, Fotiadi et al (2006) reported a value of 0.15 in Crete in the background corresponding to marine aerosols and Mishra et al (2014) found a mean AOD over the eastern Mediterranean for marine aerosols (June-August 2010) of 0.06 ± 0.01. Furthermore, it should be noted that AOD is not very sensitive to the wavelengths during these 5 days due to the presence of coarse particles.…”

Section: Pma Physical Properties In Comparison With Dust and Bbp Periodsmentioning

confidence: 99%

Optical, physical and chemical properties of aerosols transported to a coastal site in the western Mediterranean: a focus on primary marine aerosols

et al. 2017

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Abstract. As part of the ChArMEx-ADRIMED campaign (summer 2013), ground-based in situ observations were conducted at the Ersa site (northern tip of Corsica; 533 m a.s.l.) to characterise the optical, physical and chemical properties of aerosols. During the observation period, a major influence of primary marine aerosols was detected (22-26 June), with a mass concentration reaching up to 6.5 µg m −3 and representing more than 40 % of the total PM 10 mass concentration. Its relatively low ratio of chloride to sodium (average of 0.57) indicates a fairly aged sea salt aerosol at Ersa. In this work, an original data set, obtained from online real-time instruments (ATOFMS, PILS-IC) has been used to characterise the ageing of primary marine aerosols (PMAs). During this PMA period, the mixing of fresh and aged PMAs was found to originate from both local and regional (Gulf of Lion) emissions, according to local wind measurements and FLEXPART back trajectories. Two different aerosol regimes have been identified: a dust outbreak (dust) originating from Algeria/Tunisia, and a pollution period with aerosols originating from eastern Europe, which includes anthropogenic and biomass burning sources (BBP). The optical, physical and chemical properties of the observed aerosols, as well as their local shortwave (SW) direct radiative effect (DRE) in clear-sky conditions, are compared for these three periods in order to assess the importance of the direct radiative impact of PMAs compared to other sources above the western Mediterranean Basin.As expected, AERONET retrievals indicate a relatively low local SW DRF during the PMA period with mean values of −11 ± 4 at the surface and −8 ± 3 W m −2 at the top of the atmosphere (TOA). In comparison, our results indicate that the dust outbreak observed at our site during the campaign, although of moderate intensity (AOD of 0.3-0.4 at 440 nm and column-integrated SSA of 0.90-0.95), induced a local instantaneous SW DRF that is nearly 3 times the effect calculated during the PMA period, with maximum values up to −40 W m −2 at the surface. A similar range of values were found for the BBP period to those during the dust period (SW DRF at the surface and TOA of −23 ± 6 and −15 ± 4 W m −2 respectively).The multiple sources of measurements at Ersa allowed the detection of a PMA-dominant period and their characterisation in terms of ageing, origin, transport, optical and physical properties and direct climatic impact.

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“…Only night-time aerosol backscatter at 532 nm is used in this study to avoid possible noise in day-time data. All night-time aerosol backscatter profiles are screened for the artifacts using the methodology provided by Mishra et al (2014). More details about the CALIPSO algorithm and it's description are described by Winker et al (2006) and Labonne et al (2007).…”

Section: Cloud-aerosol Lidar and Infrared Pathfinder Satellite Observmentioning

confidence: 99%

Aerosol Climatology over the Bay of Bengal and Arabian Sea Inferred from Space-Borne Radiometers and Lidar Observations

Tiwari

Mishra

Singh

2016

Aerosol Air Qual. Res.

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Atmospheric aerosols over the oceanic region are very important air pollutant and play a vital role in Earth's radiation budget and climate change. This study presents the aerosol climatology over the Bay of Bengal (BoB) and Arabian sea (AS) using long term (2006)(2007)(2008)(2009)(2010)(2011)(2012) data from space-borne radiometers [Moderate-Resolution Imaging Spectroradiometer (MODIS), Ozone Monitoring Instrument (OMI)] and space-based active lidar onboard Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO). AS experiences higher AOD as compared to that over BoB during the study period. A good periodicity along with strong intra-seasonal/annual variability in aerosol loading is also observed over both the study regions. Approximately one month lag is found for maximum aerosol loading period over AS and BoB for almost every year i.e., June-July for AS and May-June for BoB. This lag could be explained by pathway and timing of summer monsoon over the Indian subcontinent. Elevated layers of absorbing dust up to 2-4 km altitudes are observed during the pre-monsoon and monsoon seasons over both the regions. The CALIPSO measurements show strong seasonal heterogeneity in aerosol properties over both the regions, which is well corroborated with MODIS and OMI observations. This significant seasonal heterogeneity in aerosol loading has been explained by the role of transportation of aerosols from various emission sources using NOAA HYSPLIT back trajectory model at three different altitude levels viz. 500, 1500 and 2500 m height. The possible role of Indian summer monsoon in modulating the aerosol behaviour over AS and BoB is another important aspect of this study that need further analyses using higher spatio-temporal resolution data.

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Radiative signature of absorbing aerosol over the eastern Mediterranean basin

Cited by 59 publications

References 87 publications

Changes in domestic heating fuel use in Greece: effects on atmospheric chemistry and radiation

Changes in domestic heating fuel use in Greece: effects on atmospheric chemistry and radiation

Optical, physical and chemical properties of aerosols transported to a coastal site in the western Mediterranean: a focus on primary marine aerosols

Aerosol Climatology over the Bay of Bengal and Arabian Sea Inferred from Space-Borne Radiometers and Lidar Observations

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